Battery-charging system



' INVENTOR.

. ATTORNEYS'.

Mar. 6, 1923.

A. H. NEULAND. BATTERY CHARGING SYSTEM. ORIGINAL men DEC. 17, 1917.

Patented Mar. 6, 1923.

UNITED STATES PATENT OFFICE.

ALFONS H. NEULAND, OF JERSEY CITY, NEW JERSEY, ASSIGNOB TO NEULAND ELECTRICAL COMPANY, INC., A CORPORLTION OF NEW YORK. v

BATTEBY-CHABGING SYSTEM.

i Original application filed December 17, 1917, Serial No. 207,509'. Divided and this application filed July 11, 1921. Serial No. 488,700.

To all whom it mwg concern:

Be it known that I, ALFONS H. NEULAND, a citizen of Russia, residing at Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Battery-Chargin tems, of which the following is a ful clear. and exact description,

My invention relates to battery Charging systems, and embodiments of my invention are serviceable for Charging storage batteries used in conjunction with generators in which the speed and load are Variable, such as the power transmission for motor vehicles, disclosed in my application Serial Number 207,509 which has matured as Patent Number 1,392349, October 4th, 1921, and of which this application is a division, although the utility of my invention is not confined to any particular type of generator apparatus.

One of the objects of my invention is to provide a 'system which wll be economical and will permit the use of a battery composed of relatively few cells with an electromagnetic power transmiion wound for a relatively high voltage. .jIn accordance with my invention the battery is connected in series with a shunt field winding on the generator, and the charging current is con- 'trolled by the shunt field current. Means are provided for rendering the battery and shunt currents independent of each other, which means include an equalizer in the form of a third or auxiliary brush on the commutator for carrying the difference between the battery and shunt currents when there is a difference. Means are also provided for preventing the rise 'of the charging current above the permissible maximum without affecting-the shunt current.

I shall now describe the illustrated embodiment of my invention and shall thereafter point out my invention in claims.

Figure 1 is a diagram of the electrical circuits of a system embodying my invention.

Figure 2 is a diagram showing the curve of the battery Charging current plotted against the shunt field current.

The generator G is Compound wound, having the series windin S and the shunt winding s. The battery is charged by the shunt current, being in Series With the shunt winding s.. Means are provided, however, for rendering the battery and shunt circuits sys independent of each other and for inserting a resistance into 'the battery circuit when the chargng current becomes too heavy. The means for rendering the two circuits independent may be termed an equalizer, and consists of a small brush b' in the commutator of the armature of the generator G between the main brushes b. This brush b' is connected to the shunt circuit at a point B and the shunt intermediate the batte winding 8. The norma circuit of the battery B includes a circuit controlling switch c controlled by an electro magnet m .energized by the current of the shunt windin 8,

voltage. When a maximum battery charging current has been-reached, the electromagnet m opens the switch c and the resistance 7' is inserted into the battery circuit. This cuts down the Charging current to a fraction of the 'maximum value and thereafter the voltage may rise to a considerable value before a maximum battery charging current is reached again; The characterstic of the Charging current and its control by* the. shunt current are illustrated in Figure 2, the sudden drop re resenting the insertion of the resistance. he field shunt current, of course, continues to rise, and since upon the opening of the switch c and theinsertion of the' resistance r, the charging and shunt currents vary, brush b' thereupon becomes operative as an equalizer and carries the difference. Under normal operating conditions the auxiliary brush b' 'carries little or no current since there is but 'little difference between the 'Charging and 'shunt field currents, and it' is principally When the switch opens that this brush is called upon to carry a substantial eqializing current.

Due to the fact that the switch c is controlled by the shunt current, it will 'be observed that the switch will remain in actuated position, irrespective of the resultant sudden rise or fall of the charging current. The current in the shunt winding is dependent on the' armature voltage only, and since the battery Charging current is also dependent upon the voltage, the rise and fall position despite the sudden rise or fall of the battery charging current due to the actuation of the Switch. r

A manually controlled Switch t in the batterv circuit may be' employed to avoid short ture when the generator circuiting of the battery 'through the armais stationary. It is obvious that various modifications may be made in the construction shown in the' drawings and scribed within the principle and scope of myabove particularly deinvention.

,I .clamz 1; In combination with a generator armature including acommutator and main .the main ing', an auxiliary brushes and a generator field havinga shunt winding, a battery charging system comprising a storage battery connected across the main brushes in series with the shunt winding, an auxiliary brush arranged between brushes and connected to the shunt conductor between' the battery and 'shunt winding, and means for varying the resistance' of the battery circuit. v v 2. In combination with a. generator armature. including a, commutator and main rushes and a generator field having a shunt winding, a battery Charging system comprising a storage battery connected across the main brushes in series wit-h theshunt windbrush arranged between the main brushes and connected to the-'shunt battery and 'shunt conductor between v the winding,

eraars winding, and a circuit controlling Switch battery crcut arranged to be con-' brushes and' a generator field having a shunt charging system com- V winding, a battery prising a storage battery connected across the main brushes in series with the shunt tween the the shunt conductor between the battery and shunt winding, and a resistance'adapted to be included in the battery circuit and arranged under the control of the shunt field current.

A 4:; In combination with a generator armature including a comnutator and main brushes and a generator field having `a shunt winding, a batterycharging system .comprisig a storage battery connected across the main brushes in series with the shunt winding, an auxilia'ry brush arranged be-` tween the main brushes and connected to the shunt conductor between the battery and .shunt winding, and a resistance and sWitch arranged in parallel in the battery circuit between the battery and the auxiliary brush connection, the Switch being under the control of the current in the shunt winding so that the increasing shunt current-actuates the Switch and inserts the resistance in the battery circuit. t v

In witness whereof, I hereunto subscribe my Signature. 3 ALFON S H. N EULAND.

an auxiliary brush arranged benan brushes and connected to 

